Chapter 13

Chapter 13 is titled - "F.U.N.".

Summary
As he walks home from work Spongebob notices Plankton in the middle of the road and after a short argument they start talking. Spongebob then befriends Plankton because he thinks he is lonely, teaching him about F.U.N. and its meaning. This friendship wouldn't last long as Plankton tries to use this as an opportunity to get the Krabby Patty formula, ultimately ending in failure for him.